Drive device for driving a matrix-type LCD apparatus
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United States of America Patent
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May 9, 1995
Issued Date -
N/A
app pub date -
Sep 11, 1992
filing date -
Apr 4, 1989
priority date (Note) -
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Abstract
A drive device for driving a matrix-type LCD apparatus comprises a voltage signal supply means for outputting a plurality of voltage signals with different levels. The voltage signals have alternately positive and negative levels with respect to an AC reference voltage applied to a counter-electrode of the LCD apparatus. The AC reference voltage is approximately 180.degree. out-of-phase with the voltage signals. The drive device also comprises a signal electrode drive means which selects one of the voltage signals depending upon an input digital video signal, and which supplies the selected voltage signal to a signal electrode of the LCD apparatus.
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